Release-valve.



P. PHELPS.

RELEASE VALVE.

AgPLIoATIoN FILED AUG. 19, 1910.

1,087,399, Patented Feb. 17,1914,

UNITED sTATEs PATENT oEEIcE..

FRANK PHELPs, or LITTLEvRocK; ARKANSAS.

RELEASE-VALVE.

Application led August 19, 1910. Serial No. 577,946.

Specification of Letters Patent.

Patented Feb. 17, 1914.

To all @ff/0m it may concern Be it known that I, FRANK PHELPS, a citizen of the United States, residing at Little Rock, in the county of Pulaski and State of Arkansas, have invented certain new and useful Improvements in .Release-Valves, of

which. they following is a specification.

i so

-f formance of its functions.

draulic presses for heavy work, where a- The object of the present invention is to provide a release valve for use in connection with hydraulic presses and other fluid-pressure apparatus, where large volumes of "fwater have to be handled quickly and work under high pressure. The said release valve is intended morev particularly to take the place of the stop-cockvlocated-in the outlet pipe from the fluid-pressure chamber of a hydraulic motor, or in thepipe line-'connecting the Huid-pressure supply pipe with the fluid supply tank into which the liquid is exhausted by the return movement of the ram. In' hydraulic motors for cotton compresses, and other heavy work,th'e said stopcock is subjected to high working pressure, and in the operation thereof serious ditliculties are encountered, first, because the fluid leaks around and from the casing of the plug, and, second, because the high pressure acting upon one side of the plug when closed renders it often very-diicult to open` the stop-cock as quickly as desired, besides w ch the repeated operations 'of the stopco` when subjected to such high pressure caisse, considerable wear and impair the perlarge volume of water has to be handled in as short a time as possible, the use of a stop- .cock'is somewhat impracticable, not only because a very large stop-cock is required,

but also because of the time consumed in turning a stop-cock of the required dimensions to olf or on positions and vice versa.

My present invention obviates the diiculties abovementioned by providing a valve for controlling the motive fluid l.which is operated by the fluid pressure, and normal y held closed thereby, but radapted to be quickly released and opened through the agency of the fluid-pressure controlled by an auxiliary cock or valve.

In the accompanying drawings which krforma Ipart of this specification: Figure 11;'

is a sectional view of a release valve embodying my invention; Fig. '2 is a detail sectional view of the auxiliary cock.

The illustrated Astructure will be, herein- Moveover, in hyafter described, and the invent-ion will be particularly pointed out in the claim appended to' this'speciication.

-In the drawings, A'is a valve-casing having inlet and outlet openings connected re-. spectlvely with a fluid-pressure pipe B and the outlet or exhaust pipe C. The fluid V pressure pipe B is or may be in communication with the pressure chamber or cylinder of a hydraulic motor, or may be a branch pipe of the fluid-pressure supply pipe (not shown) leading from the force pump to the cylinder or ram.; and in such fluid-pressure supply pipe `there would usually be placed a check valve between the pump andy branch pipe B, said check valve opening in the direction of flow of the liquid from the pump,

as and for the purpose which will be un-` derstood'by those familiar withthe art to which my invention appertains. The outlet or exhaust pipe C may lead back to the supply tank1 (not shown) from which the iuid is forced by the pump to the cylinder seated -upon the pressure side of and closes the openingin a valve-seat E, which valveseat is arranged 'between the inlet and outlet `openings aforesaid and dividesthe valvecase internally into a pressure chamber A1 and exhaust chamber A2. The valve-seat E is l,preferably made as a detachable seat ring. Below its exhaust chamber and outlet opening, the valve-case is extended toprovide a cylinder F, the end of which is preferably closed by a detachable cap orbonnet f. In

said cylinder is a piston G, which is rigidly connected with the valve-D by a stem or arbor I-I. Saidpiston has a larger crosssectionalarea than the valve. In the form shown, it is a cup-like piston of less diameter than the bore of the cylinder, and works in an annular packing. or packingring J provided in'thecylinder to make a-ifluid-t-lght closure around the' piston. In the wall 4of the cylinder is a 3"-way cock K, the case'of' which is indicated at L. The turn plug therein has a port 7c which may be a laterally transverse slot, adapted to' establish communication between the passages or ports 1 and 2, or the passages 2 and. The passage 1 is in 'communication with the fluid-pressure pipe B, througha branchpipe Bl; the passages 2 and 3 are respectively in communication with the spaces or chambers in the cylinder F below and above the piston G, or below and above the packing ring J in the struct-ure illustrated. The pipe B1L and passages 1 and 2 constitute a by-pass adapted to transfer .part of the pressure fluid to thecylinder for unseating thevvalve, and the passa e 3 constitutes an auxiliary by-pass which intersects the first mentioned by-pass and` is adapted to coperate with part of the same, namely the passage 2, to permit exhaust from the cylinder through the exhaust chamber A2.. The cock K, being arranged at the intersection of saidbypasses, constitutes a common controlling device for both of them. l

The operation is as follows: The turn plug K being inthe position shown, shutting o' communication from the branch pipe B1, the fluid-pressure in 'B maintains the valve D seated and closed.; so that the fluid under pressure in the fluid-pressurer pipe with` which the pipe B is consuppl necte is delivered tothe cylinderv Vof the hydraulic motor to operate the ram or piston therein. Whenr itV is desired to withdraw or exhaust the fluid from the motor to re.- turn the ram'to starting position, the valve D is released by turning the plug K so that its ort 7c connects the passages 1 and 2 las indicated by pressure from B through B1 into the cylinder F below the piston G, and as^said piston A has a greater area than' the valve D, 1t will lift said valve, establishingrornmunication between A1 and A2, allowing the fluidhto be withdrawn or vflow off throughthe outlet pipe C. To returnfthe valve to' its seat, for the purpose of again directing the fluidpressure to the hydraulic motor, the turn plug K is turned back to the position shown in full lines, connecting the passages 2 and 3, and shutting ,0E the passage B1. Fluiddotted lines. This admits fluidmenace pressure being., thus cut olf from the piston Gy, the valve D reseats itself under the fluidpressure in B, and the fluid under the piston in the cylinder F passes off through' the passages2 and 3 into A2 and out at C.

l am aware thatkmy invention may be made' in other structural forms, than that not desire to limit myself to any particular construction. The release valve may also .be used for other purposes, 4as, for example, to reduce or relieve the pressure in a pipe line or in any fluid pressure container.

spring M may be used to seat the valve D, in which case a check valve N'is placed in the branch pipe B1 and opens toward the cylinder F. When the piston G is raised the fluid becomes trapped in the cylinder,

-herein shown and described, and hence do j hence the spring cannot close the valve until y the fluid is released through the passages 2 and 3.

I claim as my invention and desire to secure by Letters Patent:

A release valve j for fluid-pressure pipes comprising a'valve case having pressure and exhaust chambers and an intermediate valves'eat, and having a cylinderl extending from said exhaust-chamber, a valve seated on the pressure side of said valve-seat and adapted to be held thereto by the fluid pressure, a springl acting on the valve and tending to hold it seated, a piston 'in said cylinder of larger area than the valve and connected thereto, a three-way cock, one of the pas'- sages of which is in communication with the fluid-pressure pipe Aand the two other passages of which are respectively in icorn.- rnunication with the cylinder on. opposite sides of thel piston, and a check valve in the first-mentioned passageopening toward the cylinder. y

.In testimony whereof I aiiiX mysignalture, in presence ofwtwo witnesses.

, FRANK PHELPS.- Witnessesi T. F'. Hurcninson,

En PRATHER. 

